/Engine/Source/Runtime/Core/Public/GenericPlatform/GenericPlatformMisc.h
Platform-specific normalization of path E.g. on Linux/Unix platforms, replaces ~ with user home directory, so ~/.config becomes /home/joe/.config (or /Users/Joe/.config)
static void NormalizePath ( [FString](API\Runtime\Core\Containers\FString) & InPath )